Powered converter dolly and securing device

ABSTRACT

A powered converter dolly for movement and attachment of trailers is provided. The dolly comprises a conventional converter dolly having a retractable landing gear assembly mounting wheels attached to the drawbar. The dolly has a power supply and operates as a towing device. The landing gear assembly provides steering for the dolly as well as motive power from a motor connected to the landing gear wheels. Alternatively, the wheels of the dolly may be powered for providing motion to the dolly. The dolly further comprises several attachment devices for securing the dolly to an intermodal railcar, including alternative hydraulic, mechanical, and electrically-powered tie down devices. A trolley movable along a railcar is provided for securing the dolly or trailer to the railcar and includes a hitch component for selectively interconnecting to a hitch component on the dolly or trailer.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication No. 61/247,397, filed Sep. 30, 2009, and U.S. ProvisionalPatent Application No. 61/264,392, filed Nov. 25, 2009, which areincorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosed technology relates generally to trailertransportation and securing devices, and in particular a converter dollythat is self-powered for movement around a trailer yard and for movementinto contact with a lead-trailer and a load-trailer, and a trolley thatrolls within a channel in the middle of a railroad flatcar capable ofsecuring a load thereto.

2. Description of the Related Art

A converter dolly is used to attach a load-trailer to a lead-trailer ortractor-trailer assembly thereby enabling a tractor-trailer assembly topull two or more trailers. Converter dollies generally consist of aframe having one or two axles, a coupling member for attachment to alead-trailer, and a fifth wheel plate attached to the top of the frameabove the axles for engaging the kingpin of a load-trailer. Theconventional method of assembling dollies and load-trailers requires oneor more people to manually maneuver an uncoupled dolly around a traileryard and into contact with an uncoupled trailer. After the load-trailerdolly assembly is created, a tractor-trailer assembly is backed up to itfor joining of the two assemblies. This procedure is repeated for eachload-trailer dolly assembly that is attached to a lead trailer.

The conventional method of assembling trailers and dollies createsdangerous conditions for people maneuvering the dollies and attachingthem to a tractor-trailer, and for personnel around backward movingtractor-trailer assemblies. A great deal of manual effort is required ofan operator to lift the front end of the dolly off the ground and keepthe dolly under control when maneuvering it around the trailer yardcoupling it to a load-trailer, or assisting with coupling the dolly to alead-trailer.

Problems may be encountered when transporting trailers, and multiplelinked dolly and trailer assemblies on railcars, and properly securingthem to the railcar due to the securing points on the dollies andtrailers being in unpredictable locations.

What is needed is the ability to maneuver dollies into alignment andcoupling with load-trailers, and the ability to move the load-trailerdolly assembly into alignment and coupling with a lead-trailer, withoutrequiring undue effort by an operator, or putting the operator and otherpersonnel into a dangerous situation. In addition, what is needed is theability to secure multiple trailer, and dolly and trailer assemblies toa railroad flatcar for intermodal transportation.

Heretofore there has not been available a converter dolly with theadvantages and features of the disclosed subject matter.

SUMMARY OF THE INVENTION

A self-powered converter dolly suitable for highway transportation isprovided for moving trailers around a yard, and for joining trailerswith lead-trailers. The dolly includes a frame having one or more axlesand wheels, a fifth wheel, and a drawbar and ring coupling. The drawbarmay be fixed in relation to the dolly or pivot. A powered, steerablelanding gear is attached to the drawbar of the dolly. The landing gearhas a steering control module with a hydraulic leg extending therefromattaching wheels. The steering control module controls the direction ofthe landing gear wheels, and the extending and retracting of thehydraulic leg for positioning the dolly ring coupling at the rightheight for connection with a lead-trailer. The wheels are connected to amotor that provides rotational movement to the wheels enabling the dollyto move under its own power, and to move an attached trailer around atrailer yard. The motor on the landing gear can be eitherhydraulically-powered or electrically-powered with the respective powersource being located on the dolly. In addition, the dolly provides acompressed air source to operate the air brakes on the dolly and theload-trailer.

The dolly is controlled by an operator using a remote control enablingthe operator to remain in a safe location away from the dolly andtrailer when moving the dolly, connecting the dolly to a load-trailer,and when connecting a dolly and load-trailer assembly to a lead trailer.Moreover, the self-powered converter dolly allows one operator to safelymaneuver the dolly around the trailer yard, and to couple the dolly andtrailers together avoiding excessive physical strain and injury topersonnel.

The steerable landing gear may be used with a dolly having powersupplied to the wheels on the axles of the dolly instead of powersupplied to the landing gear wheels. For dollies having only one axle,the pitch of the fifth wheel can be adjusted by a hydraulic cylinderthat pushes the wheels of the landing gear into the ground allowing thewheels to have traction. Alternatively, the fifth wheel can be providedwith a hydraulic scissor lift permitting an operator to move trailersaround a trailer yard without needing to retract the landing gear on thetrailer.

The dolly may be used with intermodal transportation systems utilizingrailway flatcars providing an attachment point for securing the dolly tothe railcar. The dolly may be secured to the railcar using a tie downsuch as a chain, ratchet load binder, hydraulic cylinder, a winch andcable, or a hitch and receiver component.

Alternatively a trolley system having a trolley with an adjustablereceiver, and movable along the length of a railcar may be used tosecure a dolly or trailer to an intermodal railcar. The trolley moveswithin a trolley guide attached to the railcar. The trolley ismaneuvered into a position for attachment to a dolly or trailer andimmobilized by inserting a pin into a hole in the trolley that alignswith a hole in the trolley guide. A circular receiver is then raised tothe appropriate height to engage a circular hitch component attached tothe dolly and is secured thereto. The receiver may then be furtheradjusted to prevent further movement of the dolly connected thereto. Thetrolley is also adapted to provide a fifth wheel type receiver forsecuring a trailer having a kingpin to a railcar. The trolley is furtherprovided with several mechanisms and actuators for raising and loweringthe receiver into position with a hitch.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constitute a part of this specification and includeexemplary embodiments of the invention illustrating various objects andfeatures thereof, wherein like references are generally numbered alikein the several views.

FIG. 1 is a perspective view of a powered converter dolly embodyingprinciples of the disclosed subject matter where the drawbar pivots onthe dolly frame, and the wheels on the landing gear are the powereddrive wheels.

FIG. 2 is a plan view of the converter dolly of FIG. 1.

FIG. 3 is an elevation view of the converter dolly of FIG. 1 with thelanding gear extended.

FIG. 4 is an elevational view of the converter dolly of FIG. 1 coupledto a load-trailer and a leading trailer, with the dolly landing gearretracted.

FIG. 5 is an elevational view of the converter dolly of FIG. 4 attachedto an intermodal railroad flatcar.

FIG. 6A is an enlarged elevational view of the tie down mechanism takengenerally within circle 6A in FIG. 5.

FIG. 6B is a sectional view of a tie down mechanism taken along the line6B in FIG. 6A.

FIG. 6C is an alternative tie down mechanism.

FIG. 6D is another alternative tie down mechanism.

FIG. 6E is another alternative tie down mechanism.

FIG. 6F is another alternative tie down mechanism.

FIG. 7 is an alternative embodiment of a powered converter dollyembodying the principles of the disclosed subject matter where thewheels on the dolly axles are the powered drive wheels.

FIG. 8 is an alternative embodiment of a powered converter dollyembodying the principles of the disclosed subject matter where thedrawbar has an extendable hydraulic jack.

FIG. 9 is an alternative embodiment of a powered converter dollyembodying the principles of the disclosed subject matter where the fifthwheel is hydraulically actuated showing the dolly backing under aload-trailer.

FIG. 10 is the dolly of FIG. 9 connecting to a trailer.

FIG. 11 is the dolly of FIG. 9 lifting a trailer for transport.

FIG. 12 is a perspective view of an alternative embodiment of a poweredconverter dolly embodying the principles of the disclosed subject matterwhere the drawbar is integrated with the dolly frame, and the wheels onthe landing gear are the powered drive wheels.

FIG. 13 is a plan view of the converter dolly of FIG. 12.

FIG. 14 is an elevation view of the converter dolly of FIG. 12 with thelanding gear extended.

FIG. 15 is an elevational view of the converter dolly of FIG. 12 coupledto a load-trailer and a leading trailer, with the dolly landing gearretracted.

FIG. 16 is an elevation view of the converter dolly of FIG. 15 attachedto an intermodal railroad flatcar.

FIG. 17A is an enlarged elevational view of the tie down mechanism takengenerally within circle 15A in FIG. 16.

FIG. 17B is an alternative tie down mechanism.

FIG. 17C is another alternative tie down mechanism.

FIG. 17D is another alternative tie down mechanism.

FIG. 17E is another alternative tie down mechanism.

FIG. 18 is an alternative embodiment of a powered converter dollyembodying the principles of the disclosed subject matter where thewheels on the dolly axle are the powered drive wheels.

FIG. 19 is an alternative embodiment of a powered converter dollyembodying the principles of the disclosed subject matter where thedrawbar has an extendable hydraulic jack.

FIG. 20 is a perspective view of the trolley system mounted on a railcarembodying principles of the disclosed subject matter.

FIG. 21 is a perspective view of the trolley of FIG. 20.

FIG. 22 is an elevational view of the dolly connected to a trailer on arailcar, and the trolley connected to the dolly.

FIG. 23 is an enlarged elevational view of the trolley connected to thedolly taken generally within circle 23 in FIG. 22.

FIG. 24 is an enlarged elevational view of the trolley connected to thedolly taken generally within circle 24 in FIG. 22.

FIG. 25 is a plan view of the trolley connected to a dolly on a railcarof FIG. 22.

FIG. 26 is an enlarged plan view of the trolley connected to a dolly ona railcar taken generally within circle 26 in FIG. 25.

FIG. 27 is a sectional view of the trolley and dolly on a railcar takenalong the line 27 in FIG. 22.

FIG. 28 is an elevational view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is supporting a trailer with a fifth wheel trailer stand.

FIG. 29 is an elevational view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is securing a tractor with an adapter and chains.

FIG. 30 is an elevational view of the adapter without chains.

FIG. 31 is a plan view of the adapter without chains.

FIG. 32 is a sectional view of the adapter along the line 32 in FIG. 31.

FIG. 33 is an elevational view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is securing a tractor using a mount secured to the frame.

FIG. 34 is an elevational view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is supporting a trailer with a stanchion.

FIG. 35 is a perspective view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is using a scissor lift to raise and lower an adjustable hitch.

FIG. 36 is an elevational view of the trolley system of FIG. 35.

FIG. 37 is a plan view of the trolley of FIG. 35.

FIG. 38 is a perspective view of an alternative embodiment trolleysystem embodying principles of the disclosed subject matter whereby thetrolley is using a scissor lift to raise and lower a mini fifth wheelhitch.

FIG. 39 is an elevational view of the trolley system of FIG. 38.

FIG. 40 is a plan view of the trolley of FIG. 38.

DESCRIPTION OF THE PREFERRED EMBODIMENT I. Introduction and Environment

As required, detailed aspects of the disclosed subject matter aredisclosed herein; however, it is to be understood that the disclosedaspects are merely exemplary of the invention, which may be embodied invarious forms. Therefore, specific structural and functional detailsdisclosed herein are not to be interpreted as limiting, but merely as abasis for the claims and as a representative basis for teaching oneskilled in the art how to variously employ the present invention invirtually any appropriately detailed structure.

Certain terminology will be used in the following description forconvenience in reference only and will not be limiting. For example, up,down, front, back, right and left refer to the invention as orientatedin the view being referred to. The words, “inwardly” and “outwardly”refer to directions toward and away from, respectively, the geometriccenter of the aspect being described and designated parts thereof.Forwardly and rearwardly are generally in reference to the direction oftravel, if appropriate. Said terminology will include the wordsspecifically mentioned, derivatives thereof and words of similarmeaning.

II. Embodiment of the Powered Converter Dolly 2

Referring to the drawings in more detail, the reference numeral 2generally designates a powered converter dolly suitable for highwaytransportation embodying the principles of the disclosed subject matter.The dolly 2 generally consists of a rectangular frame 4 having one ormore axle assemblies 18 depending therefrom, and mounting a hitchcomponent 50, such as a fifth wheel. An independent drawbar assembly 60extends forward from the frame 4 and terminates at a ring coupling 70. Asteerable landing gear assembly 82 is attached to the drawbar assembly60 providing powered movement and controlling the direction of movementof the dolly 2. The dolly 2 may be attached to an object, such as aload-trailer 106, for moving the trailer 106 around a trailer yard, orto connect the trailer 106 to a lead-trailer 105.

Referring to FIGS. 1-6F, an embodiment of the dolly 2 is shown anddescribed having two axle assemblies 18 depending therefrom includingwheels 28 and air brakes, and a powered, steerable landing gear assembly82 attached to a movable drawbar assembly 60. Referring to FIGS. 1-3,the dolly 2 is shown freestanding with the drawbar assembly 60releasably secured to the frame 4, and the landing gear assembly 82 inan extended position with landing gear wheels 98 engaging the ground.

The dolly 2 frame 4 may be manufactured from metal, preferably steel,and is generally rectangular in configuration having opposite side rails6 extending forward and rearward along the length of the frame 4. Theside rails 6 are joined at the front end by a front rail 8, and joinedat the rear end by a rear rail 10 using a secure connection such as aweld, or by fasteners such as bolts. Cross members 12 span between theside rails 6 adding rigidity to the frame 4, and permit mounting of thehitch component 50, and accessories. A pair of axle assemblies 18 eachhaving four ground engaging wheels 28 and air-powered brakes, dependfrom the frame 4. The second hitch component 50 fifth wheel comprises agenerally circular metal pickup plate 52 having an elongated,triangular-shaped slot 54 open at the rear for aligning a hitchcomponent 114 such as the kingpin of a trailer 106 with the pickup plate52. The pickup plate 52 is pivotally mounted to the frame 4 by brackets14, 15 allowing the pickup plate 52 to pitch forward or backward asneeded to engage the hitch component 114. The rear of the frame 4 maycontain inclined ramps 16 for properly guiding a trailer 106 intoengagement with the hitch component 50. The front of the frame 4 has apair of brackets 13 for rotatably mounting the drawbar assembly 60 toit.

The drawbar assembly 60 is manufactured from metal, preferably steel,and is generally triangular in configuration. The drawbar assembly 60has two side rails 67 originating from the ends of a cross member 68located nearest the frame 4, and extends forward terminating at a ringcoupling 70. The ring coupling 70 is mounted at the forward most end ofthe dolly 2 for engagement with a coupling 110 on a lead-trailer 105.The coupling 110 may include, but is not limited to a pintle hookcoupling or a combination ball hitch. Lead-trailers 105 can havecouplings 110 located at different heights above the ground. Therefore,the drawbar assembly 60 of the dolly 2 is rotatably mounted to the frame4 by brackets 62. Rotation of the drawbar assembly 60 with respect tothe frame 4 enables engagement of the ring coupling 70 to couplings 110located at different heights above the ground. Each of the brackets 13,62 have removable lock-out pins 66 for preventing rotation of thedrawbar assembly 60 with respect to the frame 4. Preventing rotation ofthe drawbar assembly 60 allows rigid engagement of the landing gearassembly 82 with the ground, described in more detail below. Safetychains 72 located adjacent to the ring coupling 70 may be attached to aleading trailer 105 for added safety in case the trailer 105 and dolly 2become uncoupled.

The landing gear assembly 82 is rotatably attached to the drawbarassembly 60 between the side rails 67 by a pivot shaft 92, and generallyconsists of a steering control module 84 having a telescoping leg 94projecting therefrom. Ground engaging wheels 98 at the distal end of theleg 94, are powered by a drive motor 100 that causes the wheels 98 torotate in both a clockwise and counterclockwise direction to providemovement to the dolly 2. The type of motor 100 used may include, but isnot limited to an electrically-powered, or hydraulically-powered motor.The steering control module 84 contains an actuator (not shown) forrotating the leg 94 and wheels 98 about a vertical axis for steering thedolly 2, and an actuator (not shown) for extending and retracting thetelescopic leg 94. The aforementioned actuators may include, but are notlimited to an electrical actuator or a hydraulic actuator. Anotheractuator 88 extends between the leg 94 and cross member 68 for movingthe landing gear assembly 82 between an extended and retracted position.The aforementioned actuator 88 may include, but is not limited to anelectric, hydraulic, or pneumatic actuator, preferably a hydraulicactuator. The actuator 88 attaches to the leg 94 and cross member 68 bybrackets 96, 90, respectively.

The dolly 2 is self-powered, providing power from one or more of thefollowing power sources: hydraulic power from a hydraulic pump 44 andhydraulic reservoir 46; electrical power from a generator 38 andrechargeable batteries 36; and compressed air from an air compressor 30and an air tank 32. Hydraulic power may be provided to: the actuator 88to extend and retract the landing gear assembly 82 between aground-engaging position and a transportation position; the steeringcontrol module 84 to power the actuator that extends and retracts thetelescopic leg 94, and the actuator that rotates the leg 94 and wheels98 for steering the dolly; and the drive motor 100 that providesmovement to the wheels 98 for moving the dolly 2. Electrical power isprovided to operate the hydraulic pump 44, air compressor 30, and torecharge the batteries 36. Alternatively, electrical power may beprovided to electrical actuators in the steering control module 84, tothe actuator 88 on the leg 94, or to an electrical drive motor 100. Thedolly 2 may incorporate any combination of hydraulic, pneumatic orelectrical actuators or motors 100 as deemed necessary for a particularapplication. Compressed air may be provided to: the actuator 88 on theleg 94; the air brake system of the dolly 2; and for connection to theair-brake system of the load-trailer 106 for releasing the air brakeswithout the need for the trailer 106 to be connected to a tractor.

Referring to FIG. 3, the dolly 2 is shown connected to a load-trailer106. The dolly 2 has a remote control 102 containing a microcontrollerand switches for controlling operation of: the landing gear assembly 82;actuator 88; the actuators in the leg 94 and steering control module 84;dolly 2 air brakes; and the hydraulic, pneumatic, or electrical powersources. The remote control 102 may include a safety feature thatrequires the operator to use both hands to operate the device, and anemergency off feature whereby the operator can cease all movement andactivity of the dolly 2 and load-trailer 106 by rapidly engaging the airbrakes of both. When not in use, the remote control 102 is securelystored within a storage box 74 located on the dolly 2. The storage box74 has a lid 76 that opens on hinges 78 by lifting on a handle 80. Alengthy cord 104 connects the remote control 102 to the dolly 2 enablingan operator to position themselves out of danger, or into a bettervantage point, when maneuvering the dolly 2 or an attached trailer 106.

The dolly 2 is prepared for use in maneuvering a trailer 106 byinserting the lock-out pins 66 into the brackets 13, 62 to secure thedrawbar assembly 60 to the frame 4 preventing their rotation thereabout.A rigid connection between the drawbar assembly 60 and frame 4 enablesthe wheels 98 of the landing gear assembly 82 to have fraction with theground. Using the remote control 102, an operator powers up the dolly 2and extends the actuator 88 positioning the landing gear assembly 82perpendicular to the drawbar assembly 60, and the wheels 98 in contactwith the ground. The motor 100 rotates the wheels 98 and moves the dolly2 in the direction the wheels 98 are pointing. The dolly 2 is maneuveredunderneath the trailer 106 enabling engagement of the hitch component 50with the bearing plate 112. The dolly 2 air brakes are then engaged. Asupply line 65, providing an electrical and air connection between thedolly 2 and trailer 16, is connected allowing the operator to engage anddisengage the air brakes on the trailer 106 using the air tank 32 on thedolly 2. Once the operator releases the air brakes on the trailer 106and dolly 2, the motor 100 provides movement to the dolly 2 permittingthe dolly 2 maneuver the trailer 106 around for repositioning or toconnect the dolly 2 and trailer 106 assembly to a lead-trailer 105.During movement, the dolly 2 and trailer 106 assembly can be stoppedusing either the air brakes on the dolly 2 or the trailer 106.

Referring to FIG. 4, the dolly 2 is shown connected to a lead-trailer105 with the landing gear assembly 82 in the highway transportationposition. An operator aligns and connects the dolly 2 to a lead trailer105 by positioning the ring coupling 70 in close proximity to thecoupling 110 located on the bumper 108 of a lead trailer 105. Theoperator engages the air brakes of the load-trailer 106. The lock-outpins 66 are then removed and the leg 94 can retract to lower the ringcoupling 70 onto a coupling 110 that is positioned low on the bumper108, or the leg 94 can be extended to raise the ring coupling 70 up to acoupling 110 that is positioned high on the bumper 108. When the ringcoupling 70 is securely engaged within the coupling 110, the safetychains 72 are connected to the bumper 108, and a supply line 64 isconnected between the lead trailer 105 and the dolly 2 providing anelectrical and air connection between the two trailers 105, 106. Thelanding gear assembly 82 is removed from contact with the ground byretracting the actuator 88 thereby rotating the assembly 82 until thewheels 98 are underneath the rear of the drawbar assembly 60. Thispositioning permits the necessary clearance between the ground and thewheels 98 when the trailers 105, 106 and dolly 2 are traveling roadways.The remote control 102 is returned to the storage box 74 during highwaytransportation. An electrical connection between the lead-trailer 105and the dolly 2 can provide power for recharging the batteries 36between uses.

The dolly 2 is disengaged from the lead trailer 105 by disconnecting thesafety chains 72 and the supply line 64 between the lead trailer 105 andthe dolly 2, powering up the dolly 2, engaging the air brakes of thefollowing trailer 106 using the air supply from the dolly 2, extendingthe actuator 88 until the wheels 98 are in contact with the ground, andextending the leg 94 to raise the ring coupling 70 off of the coupling110. The height of the drawbar assembly 60 is adjusted by extending andretracting the leg 94 to permit re-installation of the lock-out pins 66.Once there is a rigid connection between the drawbar assembly 60 and theframe 4, the operator can engage the motor 100 to move the dolly andtrailer 106 away from the lead trailer 105.

Referring to FIGS. 5-6B, the dolly 2 is shown, with the landing gearassembly 82 retracted into the highway transportation position, attachedto a lead-trailer 105 and a load-trailer 106, on an intermodal railwayflatcar 116. A similar intermodal railway flatcar system using railwayflatcars to transport trailers connected by dollies is found in U.S.Provisional Patent Application No. 61/247,397 to Banwart, filed Sep. 20,2009, the contents of which are herein incorporated by reference intheir entirety. A typical intermodal railway flatcar 116 assembly isshown having a deck 126 for supporting the dolly 2 and trailers 105,106. The railway flatcar 116 rides on a bogie 118 with wheels 122.Typically a ramp 120 may span the railcar coupling 124 permitting one ormore dolly 2 and trailer 106 assemblies to be driven onto two or morerailway flatcars 116 while still being connected to a lead-trailer 105.While one dolly 2 connecting two trailers 105, 106 is shown, one or moredollies and corresponding trailers may be jointed to create a lengthy“train” of trailers connected by dollies. The particular railway flatcar116 shown has a channel 130 bound by rails 134 running down the middlefor attaching and storing a tie down, such as a chain 132. The tie downsattach at one end to the dolly 2 by a hook 133 at one or more attachmentpoints such as a lashing ring, mounting ring, or an aperture 135 in theframe, and attach at the other end by a hook 133 to an aperture 143 inthe rail 134. The tie down secures the dolly 2 to the railway flatcar116 while it is being transported on rail lines. When the intermodalrailway flatcar 116 reaches a destination where the trailers 105, 106are to be unloaded from the railway flatcar 116, the tie down isdisconnected from the attachment point 135 and remains with the railcar116. Thereafter, the dolly 2 and trailers 105, 106 can be driven off therailcars 116.

FIGS. 6C-6F show alternative types of tie downs that may be used tosecure the dolly 2 to the railcar using the apertures 134 on the deck126 of the railcar 116, and the attachment points 135 on the dolly 2.

FIG. 6C shows a ratchet load binder 136 with hooks 133 securing thedolly 2 to the railcar 116 at the attachment point 135 and aperture 143.

FIG. 6D shows a hydraulic tie down, such as a hydraulic cylinder 138secured at one end to the deck 126 and at the opposite end on the dolly2.

FIG. 6E shows an electrical tie down secured at one end to the deck 126and at the opposite end by a hook 133 to the attachment point 135 on thedolly 2.

FIG. 6F shows a first hitch component 164, which may include, but is notlimited to a ball hitch or a beveled lug, and a second hitch component166, such as a receiver. The hitch 164 is connected to the bottom of theframe 4 at a central location below the hitch component 50. The receiver166 is hydraulically actuated and is extended up from the channel 130 ofthe railcar 116 into contact with the hitch 164 and locking the hitch164 to the receiver 166. The receiver 166 is movable within the channel130 enabling positioning of the receiver 166 along the length of therailcar 116, and laterally to permit proper positioning of the tie downdevice. All of the tie downs remain with the railcar 116 and are notpermanently attached to the dolly 2. When in use, each tie down has onepoint of contact secured to the railcar 116, and a second point ofcontact releasably secured to the dolly 2.

III. First Alternative Embodiment Powered Converter Dolly 202

Reference numeral 202 generally designates an alternative embodimentpowered converter dolly embodying the principles of the disclosedsubject matter. Referring to FIG. 7, the dolly 202 is shown having alanding gear assembly 282 that is substantially similar to the landinggear assembly 82 described above except that it does not have a motorconnected to the wheels 98. Instead, the movement of the dolly 202 is byway of a motor 226 and differential 222 operably connected to the axle19 of one of the two axle assemblies 18. The motor 226 may be anelectrical motor powered by the batteries 36 or generator 38, or may bea hydraulic motor powered by the hydraulic pump 44. Control of the motor226 is by way of the aforementioned remote control 102. Movement andcontrol of the dolly 2 and landing gear assembly 82 is as describedabove.

IV. Second Alternative Embodiment Powered Converter Dolly 302

Reference numeral 302 generally designates a second alternativeembodiment powered converter dolly embodying the principles of thedisclosed subject matter. Referring to FIG. 8, the dolly 302 is shownhaving a landing gear assembly 82 and a hydraulic ram 330 attached tothe top of the drawbar assembly 60. The hydraulic ram 330 is powered bythe hydraulic pump 44 and operated by the remote control 102. Thehydraulic ram 330 is extended to engage a receiver on the bumper 108 ofa lead-trailer 105, and retracted to draw the dolly 2 closer to aleading trailer 105 in order to align the ring coupling 70 with acoupling on the leading trailer's bumper. The hydraulic ram 330 may beused with or without the aid of the motors 226, 100 during thismaneuver.

V. Third Alternative Embodiment Powered Converter Dolly 402

Reference numeral 402 generally designates a third alternativeembodiment powered converter dolly embodying the principles of thedisclosed subject matter. Referring to FIG. 9, the dolly 402 is shownwith a hydraulic fifth wheel assembly 444 that allows an operator tomove a trailer 106 without retracting the landing gear 107. The assembly444 consists of a fifth wheel 445 pivotally attached to a top plate 446.The top plate 446 is attached to a bottom plate 448 by a pair of linked,folding support arms 450 arranged in a crisscross “X” pattern. Anactuator 452, such as a hydraulic cylinder, provides pressure against anarm 450 to raise and lower the fifth wheel 445. The actuator 452 may bepowered by the hydraulic pump 44 and operated by the remote control 102.In operation, the dolly 402 is powered up and backed under a trailer106, using the remote control 102, aligning the fifth wheel 445 with thehitch component 114 and bearing plate 112 on the trailer 106. A supplyline 64 is connected to the dolly 402 and the trailer 106 providingelectrical power from the dolly 402 batteries 36 or generator 38 to theelectrical system of the trailer 106, and providing pneumatic power fromthe air tank 32 to the trailer enabling the operator to control theengagement and disengagement of the trailer 106 air brakes with theremote control 102. After the trailer 106 air brakes have been engagedpreventing the trailer 106 from rolling, the hydraulic fifth wheelassembly 444 is moved upward into contact with the bearing plate 112(FIG. 10) lifting the trailer up off of the ground (FIG. 11) withouthaving to retract the landing gear 107. Once the landing gear 107 areoff of the ground, the operator can release the air brakes on thetrailer 106 and may then move the trailer using the powered dolly 402.The trailer 106, with landing gear 107 extended, may be left in a targetlocation by lowering the hydraulic fifth wheel assembly 444 and bringingthe landing gear 107 into contact with the ground. Thereafter, thesupply line 64 can be disconnected and the dolly 402 may be used forother duties.

VI. Fourth Alternative Embodiment Powered Converter Dolly 502

Referring to FIGS. 12-17E, the reference numeral 502 generallydesignates a fourth alternative embodiment powered converter dollysuitable for highway transportation embodying principles of thedisclosed subject matter. The dolly 502 has many similarities to thedollies mentioned above. As such, the differences will be describedbelow.

The dolly 502 generally consists of a rectangular frame 504 having asingle axle assembly 18 depending therefrom, and mounting a hitchcomponent 50 such as a fifth wheel. An integrated drawbar assembly 560extends forward from the frame 504 and terminates at a ring coupling 70.A steerable landing gear assembly 82, as described above, is attached tothe drawbar assembly 560.

Referring to FIGS. 12-14, the dolly 502 is shown freestanding with thelanding gear assembly 82 in an extended position with the wheels 98engaging the ground. The dolly 502 frame 504 has opposite side rails506, a front rail 508, a rear rail 510, and cross members 512. The frame504 of the instant dolly 502 has only one axle assembly 18 dependingtherefrom including wheels 28 and air brakes. The dolly 502 includes ahitch component 50, as described above, that is attached to the frame504 by brackets 14, 15. An actuator 558, located on the frame 504 belowthe front of the fifth wheel, is for adjusting the pitch of the fifthwheel, described in more detail below. The rear of the frame 504 maycontain inclined ramps 516 for properly guiding a trailer 160 thereon.

The dolly 502 frame 504 and drawbar assembly 560 are manufactured frommetal, preferably steel. The drawbar assembly 560 is generallytriangular in configuration and has two side rails 567 that originatefrom the ends of the front rail 508, and extend forward terminating at aring coupling 70.

The landing gear assembly 82 is the same as described above however, therear of the actuator 88 is attached by a bracket 90 to the forward faceof the front rail 508.

The instant dolly 502 is self-powered just as the dollies above, havingthe same power sources: a hydraulic pump 44 and reservoir 46; anelectrical generator 38 and rechargeable batteries 36; and an aircompressor 30 and air tank 32. Hydraulic, pneumatic, and electricalpower are supplied to the same components for the same reasons asdescribed above, including hydraulic, pneumatic, or electrical power tothe actuator 58.

Referring to FIG. 14, the dolly 502 is shown connected to a load-trailer106. Because the dolly 502 has only one axle assembly 18 to bear theweight of the load-trailer 106, the load-trailer 106 has a tendency tocause the front of the drawbar 560 to pitch up. Therefore, the actuator558 is used to bias against the bottom of the fifth-wheel causing thelanding gear assembly 82 to be pushed down toward the ground, in turn,bringing the wheels 98 into contact with the ground. The actuator 558may be either a hydraulic cylinder, a pneumatic cylinder, or anelectrical actuator, and is powered by the appropriate power source onthe dolly 502. As the actuator 558 is extended, the wheels 98 are pushedinto the ground with greater force permitting the wheels 98 to haveenough traction on the ground to allow the landing gear assembly 82 tosteer, or the motor 100 to move, the load-trailer 106. Control andoperation of the actuator 558 and the mechanical components of the dolly502 is via the remote control 102. The remote control 102 in thisembodiment is used and stored in the same manner as describe above.

The dolly 502 is prepared for use in maneuvering a trailer 106 by theoperator using the remote control 102 to power up the dolly 502. Thelanding gear assembly 82 is rotated into position by extending theactuator 88. The operator engages the motor 100 rotating the wheels 98and moving the dolly 502 in the direction the wheels 98 are pointing.The dolly 502 is maneuvered underneath the trailer 106 enablingengagement of the fifth wheel with the bearing plate 112. The air brakeson the dolly 502 are engaged and a supply line 64 is connected betweenthe trailer 106 and dolly 502 providing an electrical and air connectionbetween the dolly 502 and trailer 106 allowing the operator to engageand disengage the air brakes on the trailer 106 using the air tank 32 onthe dolly 502. The operator then adjusts the actuator 558 to push thelanding gear assembly 82 into the ground in order to give the wheels 98enough fraction to effectively steer the trailer 106 and allow the motor100 to rotate the wheels 98 for moving the load-trailer 106. Once theoperator releases the air brakes on the load-trailer 106 and dolly 554,the motor 100 rotates the wheels 98 permitting the dolly 502 to maneuverthe load-trailer 106 around for repositioning or to connect the dolly502 and load-trailer 106 assembly to a lead-trailer 105. Duringmovement, the dolly 502 and load-trailer 106 assembly can be stoppedusing either the air brakes on the dolly 502 or the load-trailer 106.

Referring to FIG. 15, the dolly 502 is shown connected to a lead-trailer105 with the landing gear assembly 82 in the highway transportationposition. The dolly 502 is attached to the lead-trailer 105 as describedabove. The ring coupling 70 is positioned at the right height byextending and retracting either the leg 94 or the actuator 558. A supplyline 64 is connected between the lead-trailer 105 and the dolly 502 asdescribed above. The landing gear assembly 82 is moved into highwaytransportation position by retracting the actuator 88 until the wheels98 are underneath the rear of the drawbar assembly 560. The actuator 558is retracted sufficiently to permit the fifth wheel to pitch forward andbackward as needed when the dolly 502 is traveling over the roadway.Disengaging the dolly 502 from the lead-trailer 105 is accomplished byfollowing the steps above in reverse. The remote control 102 is returnedto the storage box 74 during highway transportation. As above, thelead-trailer 105 can recharge the rechargeable batteries 36 betweenuses.

Referring to FIG. 16, the dolly 502 is shown in the highwaytransportation position attached to a lead-trailer 105 and aload-trailer 106 on an intermodal railway flatcar 116. The railwayflatcar 116 and its assorted components are as described above. Thedolly 502 is shown secured to the railcar 116 by a tie down, such as achain 132. As above, the tie downs attach to the dolly 502 at one ormore attachment points such as a lashing ring, mounting ring, or anaperture 535 in the frame 504, and remain with the railway flatcar 116when not connected to the dolly 502. FIGS. 17A-17E shown alternativetypes of tie downs that may be used including a mechanical tie-down,such as a ratchet load binder 136, a hydraulic tie down, such as ahydraulic cylinder 138, an electrical tie down, such as an electricalwinch 140 and cable 141, and a hitch 164 attached to the axle 19 of theaxle assembly 18 and receiver 166, each of which operate as describedabove. The aforementioned tie downs operate in the same manner asdescribed in FIGS. 6A-6F described above.

VII. Fifth Alternative Embodiment Powered Converter Dolly 602

Reference numeral 602 generally designates a fifth alternativeembodiment powered converter dolly embodying the principles of thedisclosed subject matter. Referring to FIG. 18, the dolly 602 is shownhaving a landing gear assembly 682 that does not have a motor connectedto the wheels 98 but has movement by way of a motor 626 and differential622 operably connected to the axle 19 of the axle assembly 18. The motor626 and differential 622 are of the type, and operate in the samemanner, as described above.

VIII. Sixth Alternative Embodiment Powered Converter Dolly 702

Reference numeral 702 generally designates a sixth alternativeembodiment powered converter dolly embodying the principles of thedisclosed subject matter. Referring to FIG. 19, the dolly 702 is shownhaving a landing gear assembly 82 and a hydraulic ram 730 attached tothe top of the drawbar assembly 560. The hydraulic ram 730 is of thesame type, and operates in the same manner, as the hydraulic ram 330described above.

It will be appreciated that the components of the dollies 2, 202, 302,402, 502, 602, and 702 may be used for various other applications.Moreover, the dollies may be fabricated in various sizes and from a widerange of suitable materials, using various manufacturing and fabricationtechniques.

IX. Embodiment of the Trolley System 802

Reference numeral 802 generally designates a trolley system embodyingthe principles of the disclosed subject matter. Referring to FIGS.20-27, the trolley system 802 is shown and described. In particular, thetrolley system 802 has a trolley 804 movable on a railcar 116 within atrolley guide 840, and has a hitch component 822 movable within a frame806. The hitch component 822 is selectively interconnectable with ahitch component 864 attached to an object including, but not limited toa dolly 2, 202, 302, 402, 502, 602, and 702, a trailer 105, 106, a fifthwheel stand 952, a connector ring 1062, or a tractor 1086.

Referring to FIG. 21, the trolley 804 generally consists of a frame 806having an interior and an exterior whereby the interior is bounded byopposite end walls 808, side walls 810, and a bottom wall 812. A flange814 extends laterally from each side wall 810 overlapping a channel 842of the trolley guide 840. The flange 814 has a plurality of equallyspaced receivers 816 that align with receivers 844 in the trolley guide840. The receivers 816, 844 are adapted for receiving a locking membersuch as an elongated pin 834. A plurality of equally spaced wheels 818are on the exterior of each side wall 810, and are adapted for rollingwithin the channel 842.

The hitch component 822 may be selectively positioned at any point alongthe length or width of the trolley 804 using one or more horizontalactuators. The horizontal actuators may be a longitudinal actuator 824or a transverse actuator 826. The hitch component 822 may be positionedalong the length of the trolley 804 by adjusting the longitudinalactuator 824. The actuator 824 may be operated using an arm crank 832located at one end wall 808 of the trolley 804, or by engaging a motor830 located at the opposite end wall 808. The hitch component 822 may bepositioned at any point along the width of the trolley 804 by adjustingthe transverse actuator 826. The actuator 826 operates by engaging amotor 830 located at one end wall 808 of the trolley 804, or by using anarm crank 832 located at the opposite end wall 808. The arm cranks 832and motors 830 may be locked down or locked-out to prevent unwantedmovement of the hitch component 822. The motor 830 may be a hydraulic,pneumatic, or electric motor powered by a complimentary power source.Alternatively, the actuators 824, 826 that move the hitch component 822may be a roller pinion system such as the type manufactured by NexenGroup, Inc. of Vadnais Heights, Minn.

The hitch component 822 selectively interconnects with a second hitchcomponent, such as a hitch 864. The hitch component 822 is adapted toreceive the hitch 864 and lock the two securely together usingconventional locking devices known in the hitch industry. The hitchcomponent 822 may include, but is not limited to a circular receiverhaving a bell-shaped opening. The hitch 864 may include, but is notlimited to a king pin or a cylindrical object such as a ball hitch or abeveled lug.

Referring to FIGS. 22-27, the trolley 804 is shown connected to dollies2 and trailers 106 mounted on railcars 116. Although the trolley 804 isshown connected to a dual-axle dolly 2, use of a dual-axle dolly 2 isintended to be exemplary and does not limit the scope of suitabledollies that may be used with the trolley system 802. Therefore, thetrolley 804 may be used with the dollies 2, 202, 302, 402, 502, 602, and702 described above, or other types of multi-axle dollies. Referring toFIGS. 22 and 23, the trolley 804 is shown connected to a dual-axle dolly2, and secured to one railcar 116. The trolley 804 attaches to the dolly2 by connecting the hitch component 822 to a hitch 864. The hitch 864may be generally located below the hitch component 50 and connected tothe frame 4 by a mount 862. Once the dolly 2 and trailer 106 arepositioned on top of the railcar 116, the trolley 804 is moved along thelength of the railcar 116 within the trolley guide 840 to position theinterior of the trolley 804 generally underneath the hitch 864. Thereceivers 816, 844 are aligned on at least one railcar 116. In theparticular application depicted in FIG. 23, because the location of thehitch 864 is so close to the gap between two separate railcars 116, thetrolley 804 spans the gap. The multitude of wheels 818 on the trolley804 enable it to remain in contact with at least one railcar 116 when inuse, even when spanning two railcars 116. After generally positioningthe trolley 804, at least one pair of locking members 834 are insertedinto the receivers 816, 844 on either end of the trolley 804 to create asecure connection between the trolley 804 and the railcar 116. The hitchcomponent 822 is then positioned below the hitch 864 by adjusting thelongitudinal actuator 824 and the transverse actuator 826. When thehitch component 822 and hitch 864 align, the hitch component 822 israised into engagement with the hitch 864 by the height actuator 828securing the dolly 2 to the railcar 116. The height actuator 828 ispowered by a complimentary power source and may include, but is notlimited to a hydraulic or pneumatic piston and cylinder unit, a scissorlift, a screw-type actuator such as the RACO screw electric actuatormanufactured by RACO International, LP of Bethel Park, Pa., or anassembled columnar actuator such as the I-Lock Spiralift manufactured byPACO Spiralift, Inc. of Quebec, Canada. When the dolly 2 and trailer 106are ready to be removed from the railcar 116, the hitch component 822and hitch 864 are disengaged and the hitch component 822 is retractedback into the trolley 804 so it does not obstruct passage of the dolly 2or trailer 106 above, or contact any obstructions depending therefromsuch as a hitch 864. The trolley 804 may be repositioned by removing thelocking members 834 and moving the trolley 804 along the length of therailcar 116. The trolley 804 may remain with the railcar 116 when not inuse.

Referring to FIGS. 24 and 26, the trolley 804 is shown connected to adolly 2 as described above however, the trolley 804 is located entirelyon one railcar 116 therefore, two pairs of locking members 834 at eitherend of the trolley 804 are used to secure the trolley 804 to the railcar116.

The trolley 804 described above has been shown connected to a dollyhowever, the trolley 804 may be connected to any suitable object havinga hitch 864 depending therefrom including, but not limited to a tractor,a trailer, or an accessory. An accessory may include, and is not limitedto a fifth wheel stand 952, or a connector ring 1062.

X. First Alternative Embodiment Trolley System 902

Reference numeral 902 generally designates a first alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIG. 28, the trolley system 902 is shownand described including a trolley 904 having a fifth wheel stand 952that may support the forward end of a lead-trailer 105. A fifth wheelplate 954 is located at the top of the stand 952 for receiving thebearing plate 112 and hitch component 114 on the trailer 105. The plate954 is connected to the trolley 904 by four elongated support members956 depending, and equally spaced at the periphery of the plate 954. Theopposite end of the supports 956 are received within the receivers 816in the flange 814. A hitch 864, centered below the plate 954, isconnected to each of the supports 956 by brackets 958. The hitchcomponent 822 is positioned below the hitch 864 as described above andattaches to the hitch 864 securing the stand 952, and in turn thetrailer 105 to the trolley 202. The trolley 904 may be movable on therailcar 116 within a trolley guide 840, and secured to the railcar usingthe locking members 834 as described above.

XI. Second Alternative Embodiment Trolley System 1002

Reference numeral 1002 generally designates a second alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIGS. 29-32, the trolley system 1002 isshown and described including a trolley 1004 securing an object, such asa tractor 1086 to a railcar 116 using a connector ring 1062. Theconnector ring 1062 is a circular mushroom-shaped device having a hitch1064, similar to the hitch 864 described above, depending from thecenter. A plurality of slots 1066 radiate out from the top of the body1065 providing an attachment point for the links of a chain 1072 hangingbelow the frame 1088 of the tractor 1086. A plurality of eyelets 1068located at the edge of the body 1065 are provided for receiving hooks(not shown) that may be attached to the end of the chains 1072. Theconnector ring 1062 is mounted by either first attaching the ring 1062to the chains 1072, or by attaching the ring 1062 to the trolley 1004.When first attaching the ring 1062 to the chains 1072, three or morechains 1072 are equally spaced apart and connected to the slots 1066 oreyelets 1068 in the connector 1062. The trolley 1004 is then positionedbelow the hitch 1064 and attached in the manner described above. Whenfirst attaching the ring 1062 to the trolley 1004, the hitch 1064 isplaced in the hitch component 822 and the ring 1062 is raised to aheight below the frame 1088 to enable the chains 1072 to be properlyconnected. When the chains 1072 are connected, the hitch component 822is drawn down toward the trolley 1004 securing the tractor 1086 to therailcar 116. The trolley 1004 may be movable on the railcar 116 within atrolley guide 840, and secured to the railcar 116 using the lockingmembers 834 as described above.

XII. Third Alternative Embodiment Trolley System 1102

Reference numeral 1102 generally designates a third alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIG. 33, the trolley system 1102 is shownand described including a trolley 1104 securing a tractor 1086 to arailcar 116 using a hitch 864 directly attached to the frame 1088 of thetractor 1086 by a mount 862. The trolley 1104 operates in the samefashion as the trolley system 802 described above when positioning thetrolley 1104 along the railcar 116 using the trolley guide 840, andsecuring the tractor 1086 to the railcar 116.

XIII. Fourth Alternative Embodiment Trolley System 1202

Reference numeral 1202 generally designates a fourth alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIG. 34, the trolley system 1202 is shownand described including a trolley 1204 having a collapsible stanchion1276 for supporting an end of a trailer 105 having a hitch component114. The trolley 1204 is generally of the same construction as thetrolley 804 above without the hitch component 822 and the associatedactuators and hardware supporting the hitch component 822 operation. Theinstant trolley 1204 has a stanchion 1276 supported by vertical andangular supports 1280 mounting a stanchion plate 1278. The stanchionplate 1278 is laterally self aligning and operates in the same manner asthe hitch component 50 described above for receiving the bearing plate112 and the hitch component 114 of a trailer 105. The trolley 1204 maybe movable along the railcar 116 using the trolley guide 840, andsecured to the railcar 116 using the locking members 834 as describedabove. The trolley 1274 may remain with the railcar 116 when not in use.

XIV. Fifth Alternative Embodiment Trolley System 1302

Reference numeral 1302 generally designates a fifth alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIGS. 35-37, the trolley system 1302 isshown and described including a trolley 1304 using a scissor lift 1326to raise and lower a hitch component 1322. The trolley 1304 is shownabsent the trolley guide 840, however the instant trolley 1304 moveswithin the trolley guide 840 in the same manner as the trolleysmentioned above. The scissor lift 1326 is designed and functions in asimilar manner to a conventional scissor lift using an actuator 1330 tobias against the lifting structure to raise and lower a frame 1328. Theactuator 1330 is powered by a complimentary power source and maycomprise the types of actuators used in conjunction with the heightactuator 828 described above. Alternatively, the frame 1328 may beraised and lowered using the I-Lock Spiralift described above. The hitchcomponent 1322 is laterally adjustable by rotating a shaft 1340 having agear 1338 against a worm gear shaft 1336. The hitch component 1322 isconnected to the worm gear shaft 1356 by a collar 1346. The collar 1346pivots on the arm 1332 when the hitch component 1322 is moved laterally.The arm 1332 is connected to the frame 1328 by a crossbar 1348 having apin 1334. The pin 1334 permits the arm 1332 and hitch component 1322 torotate thereabout. The shaft 1340 may be rotated by a hand crank,electric motor, or an air ratchet to align the hitch component 1322 witha hitch 864. A pair of rods 1344 for capturing the hitch 864 within thehitch component 1322 are spring loaded to engage the hitch 864. Alockout lever 1342 has a cam that is rotated to separate the rods 1344for disengaging the hitch component 1322 and hitch 864 (FIG. 37). Thetrolley 1304 may be secured to the railcar using the locking members 834as described above.

XV. Sixth Alternative Embodiment Trolley System 1402

Reference numeral 1402 generally designates a sixth alternativeembodiment trolley system embodying the principles of the disclosedsubject matter. Referring to FIGS. 38-40, the trolley system 1402 isshown and described including a trolley 1404 using a scissor lift 1326to raise and lower a mini-fifth wheel hitch 1412. The scissor lift 1326is designed and functions in a similar manner as above, and is used toraise and lower a platform 1420 having a mini fifth wheel hitch 1412attached. The fifth wheel hitch 1412 has a pickup plate 1414 with a slot1416 for receiving the kingpin of a trailer. The fifth wheel hitch 1412is pivotally attached to a base plate 1418. The base plate 1418 ismovable along the length of the platform 1420 within an elongatedaperture 1422 disposed within the platform 1420. A pivot pin 1424 at therear of the base plate 1418, and a guide pin 1426 extending from thelever 1428 at the front of the base plate 1418, guide the base plate1418 along the aperture 1422. Because the kingpin on a trailer may notperfectly align with the center of the platform 1420, the fifth wheelhitch 1412 may freely move laterally within a curved aperture 1430 inthe base plate 1418, pivoting about the pivot pin 1424, to self alignwhen being positioned beneath a trailer and capturing the kingpin. Whenthe fifth wheel hitch 1412 engages the kingpin, a lever 1428, having aguide pin 1426 that passes through the platform 1420 and base plate1418, may be rotated to create a camming force to press the platform1420 and plate 1418 together to immobilize the base plate 1418 lockingthe fifth wheel hitch 1412 in place. A lock out pin 1432 extends acrossthe slot 1416 and may be manually operated to secure the kingpin withinthe slot 1416. The trolley 1404 may be movable along the railcar 116using the trolley guide 840, and secured to the railcar using thelocking members 834 as described above.

It will be appreciated that the components of the aforementioned trolleysystems 802, 902, 1002, 1102, 1202, 1302, and 1402 may be used forvarious other applications. Moreover, the trolley systems may befabricated in various sizes and from a wide range of suitable materials,using various manufacturing and fabrication techniques.

It is to be understood that while certain aspects of the disclosedsubject matter have been shown and described, the disclosed subjectmatter is not limited thereto and encompasses various other embodimentsand aspects.

Having thus described the disclosed subject matter, what is claimed asnew and desired to be secured by Letters Patent is:
 1. A dolly formoving a trailer having a first hitch component, which dolly comprises:a frame having front and back ends; a drawbar extending from said framefront end; an axle assembly depending from said frame, said axleassembly having a ground engaging wheel; a landing gear assemblypivotally attached to said drawbar, said landing gear assembly comprisedof: (a) a steering mechanism; (b) a leg having first and second ends,said first end connected to said drawbar; and (c) a landing gear wheelmounted to said leg second end, said wheel being connected to saidsteering mechanism; said landing gear assembly having a lowered positionwhereby said landing gear wheel engages the ground, and having a raisedposition whereby said landing gear wheel is proximate to said drawbar;and a second hitch component selectively interconnectable with the firsthitch component, said second hitch component disposed on top of saidframe.
 2. The dolly of claim 1, including: a drive motor operablyconnected to one of said axle assembly wheel or said landing gear wheel;and a drive motor power source operably connected to said motor.
 3. Thedolly of claim 2, wherein: said steering mechanism includes a steeringactuator for rotating said leg; and a steering mechanism power sourceoperably connected to said steering actuator.
 4. The dolly of claim 3,including: a landing gear actuator, said landing gear actuator includinga piston and cylinder unit pivotally connected to said frame and saidleg for positioning said landing gear assembly between a loweredposition and a raised position; and a landing gear actuator power sourceoperably connected to said landing gear actuator.
 5. The dolly of claim3, including: said leg comprising a piston and cylinder unit movablebetween an extended position and a retracted position; a leg actuatoroperably connected to said leg for extending and retracting said leg;and a leg actuator power source operably connected to said leg actuator.6. The dolly of claim 3, further including: a braking system, saidbraking system operably connected to said axle assembly; and a brakingsystem power source operably connected to said braking system.
 7. Thedolly of claim 6 wherein said dolly-to-trailer hitch second component ismovable vertically with respect to said frame.
 8. The dolly of claim 1,including: a pitch actuator located on said frame; said pitch actuatorattached to said frame and contacting said dolly-to-trailer hitch secondcomponent; and a pitch actuator power source operably connected to saidpitch actuator.